<template>
	<el-dialog title="上传凭证" v-model="visible" :before-close="handleClose" :close-on-click-modal="false">
		<el-card>
			<el-upload
				class="avatar-uploader"
				action="http://localhost:8080/upload"
				:show-file-list="false"
				:on-success="handleAvatarSuccess"
				:before-upload="beforeAvatarUpload"
			>
				<img v-if="imageUrl" :src="imageUrl" class="avatar" />
				<el-icon v-else class="avatar-uploader-icon"><Plus /></el-icon>
			</el-upload>
		</el-card>
		<template #footer>
			<div>
				<el-button @click="handleClose">关闭</el-button>
			</div>
		</template>
	</el-dialog>
</template>

<script setup>
import { reactive } from 'vue'

const state = reactive({})

import { ref } from 'vue'
import { ElMessage } from 'element-plus'
import { Plus } from '@element-plus/icons-vue'

const imageUrl = ref('')
const visible = ref(false)

const handleAvatarSuccess = (response, uploadFile) => {
	imageUrl.value = URL.createObjectURL(uploadFile.raw)
}

const beforeAvatarUpload = rawFile => {
	if (rawFile.type !== 'image/jpeg') {
		ElMessage.error('Avatar picture must be JPG format!')
		return false
	} else if (rawFile.size / 1024 / 1024 > 2) {
		ElMessage.error('Avatar picture size can not exceed 2MB!')
		return false
	}
	return true
}

const handleClose = () => {
    visible.value = false
}

const open = () => {
    visible.value = true
}

defineExpose({
    open
})
</script>

<style scoped lang='scss'>
.avatar-uploader .avatar {
	width: 178px;
	height: 178px;
	display: block;
}
</style>

<style>
.avatar-uploader .el-upload {
	border: 1px dashed var(--el-border-color);
	border-radius: 6px;
	cursor: pointer;
	position: relative;
	overflow: hidden;
	transition: var(--el-transition-duration-fast);
}

.avatar-uploader .el-upload:hover {
	border-color: var(--el-color-primary);
}

.el-icon.avatar-uploader-icon {
	font-size: 28px;
	color: #8c939d;
	width: 178px;
	height: 178px;
	text-align: center;
}
</style>